Ive done this side quest multiple times now, and the one time I sided with the Nords I regretted it terribly. I mean other than for reasons of morality I just don't see what they offer, and on the other hand you end up with literally the best pet followers in game and the only ones that I believe can carry items for you and wear them. Still I always get a twinge of guilt wiping out the Nord Camp. Wondering what most other people do in this situation.